A look at hackers and the Occupy movement

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Additionally, information was "compromised" in a hacking of Alabama state websites, the Alabama Department of Homeland Security said in a news release.

"We are aware of the current situation regarding individual(s) claiming responsibility for hacking into a state of Alabama ... public website," Alabama Department of Homeland Security Director Spencer Collier said in the release.

Jack Doane, director of Alabama's Information Services Division, told CNN later by e-mail that state technology experts "are conducting a forensic analysis to determine what if any information has been compromised."

It was not immediately clear what websites were hacked or who was responsible. A web page that included Anonymous' signature tag line stated the hacking was in response to Alabama's "recent racist legislation in an attempt to punish immigrants as criminals" -- referring to legislation, signed last June, aimed at cracking down on illegal immigration in the state.

The Anonymous-related Twitter page also provided links to documents, messages and other files that it said it had taken off a website tied to Mexico's mining ministry.